Track-drill



(N6 Model.)

' E. S. HART.

TRACK DRILL.

N0.286.298. 1. Patented 0@1-,.9,188a.

PATENT ELI S. HART, OF CLINTON, IOWA.

TRACK-DRILL.

SPECIFICATION forming part of Letters Patent No. 286,298, dated October 9, 17883.

To @It whom t may concern:

Be it known that I, ELI S. HART, of Clinton city, in the county of Clinton and State of Iowa, have invented certain new and useful Improvements in Track-Drills; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

My invention relates to drills, and more `particularly to that class of drills adapted for drilling railroad-rails; and it consists in parts and combination of parts, which will be more fully hereinafter described and claimed.

In the drawings, .Figure l is a view in elevation of a drillconstructed according to my invention attached to a rail and in a position for operation. Fig. 2 is a plan view of the drill.

In the drawings, A represents the frame, preferably made of metal, and adapted to hold and contain the operative parts of my device. This frame is provided with a nose, which bears against one side of the tread of the rail. To prevent lateral motion of the drill, when attached to the rail, it may be provided with two noses or points of Contact, as show in Fig. 2 of the drawings.

A and A2 are bearings for the sleeve and spindle. I

A. is a third bearing adapted to support the outer end of the shaft carrying the feedby a shaft passing through it, said shaft turning in the bearings y y of the frame A, or in any other suitable manner. This cam is operated by the lever Vf. The object of this portion of my invention is to afford means by which the drill may be readily clamped to the rail.

can be obtained by the interposition of a wedge, W, between the face of the cam V and I find by experience that a better grip Application filed May 11, 1882. Renewed August 2B, 1&83. (No model.)

the rail, although I do not limit myself to the use of this wedge; but when a wedge is used I prefer to make its iiiner face of converging inclines, to bite the tread of the rail on one side, the opposite side of the wedge being circular in form, corresponding to the form of the face of the cam.

T is a feed-screw, which may be operated by any of the well-known methods for feeding the drill to the rail as fast as it cut-s.

N is a crown-gear keyed or otherwise secured to the main driving -shaft O.A This meshes into another gear, M, which is permanently attached to the vertical shaft L within the upright sleeve B. To the other end of this vertical shaft L is secured another crowngear, K, which in turn meshes with the crown gear F upon the spindle G.

The operation of my device is as follows: The machine is attached to the rail, and held rigidly in position by the bearing upon one side and cam V upon the other, which is forced againstthe rail Z. IVhen the head of the rail is so small as to prevent the cam Vfrom bearing sufficiently hard against it, a wedge, WV, is interposed, as shown in Fig. l. This manner of fastening the drill is far preferable to any of which I am aware, as it can be done rapidly, and a single machine is adapted for fitting all sized rails. The machine having been thus firmly secured to the rail and in the proper place, the cranks l?" P are operated, which, by means of the gear-connection and shaft L, drive the spindle carrying the drill, and the drill is set in motion. When the hole is completed, the drill is released and drawn back, and the lever V" being raised, the machine releases its grip upon the rail and is ready for another operation.

Vhat I claim is- 1. In a track-drill, the combination, with the drill, the horizontal and'vertical shafts, and a frame provided with an armor projection, X, which engages one side of the rail, of the cam V and cam-lever V', substantially as set forth.

2. In a track-drill, the combination, with the drill, the horizontal and vertical shafts,

and a frame provided with an. arm or proj ection, X, which engages one side of the rail, of the cam V, cam-lever V, and' wedge W, substantially as set forth.

IOC)

3. In a track-drill, 'the combination, with the drill, feedingsorew and Wheel, upright shaft7 and driving-shaft, of the frame provided with an arm that bears against one side of the 5 tread of zt rail, and a @am and cam-lever for securing the from@ in place, substantially as set forth.

In testimony whereof I have signed my namey to this specification in tho presence of two sub- Ttnessesz CHARLES A.. FRYE, ALBERT E. LYNCH. 

